Collections
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GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
Last Release on Mar 14, 2016

A Java 8 collections helper library. Whenever possible, it tries to be API-compatible to Google Guava.
Last Release on Nov 21, 2016
This artifact provides efficient implementations for various collection data structures (esp. linked lists and priority queues), which have very insufficient implementation in the Java Collections Framework that makes it hard or even impossible to exploit their efficiencies.
Last Release on Mar 11, 2025
Google Collections Library is a suite of new collections and collection-related goodness for Java 5.0
Last Release on Jun 5, 2008

Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.
Last Release on Sep 12, 2023
Conversant Disruptor - very high throughput Java BlockingQueue
Last Release on Oct 18, 2022
Utility library for collections, comparators and iterator classes
Last Release on Oct 8, 2024
util-collection
Last Release on Jan 10, 2019
Utility library for collections, comparators and iterator classes
Last Release on Aug 10, 2022

Java implementation of a concurrent trie hash map from Scala collections library
Last Release on Sep 18, 2014